Prevent invalid filter values from being saved (#215)

By assuming that all input is invalid until the api tells us otherwise,
we can prevent the user from clicking the save button in the time between
the value being entered and the api returning.

superset-frontend/src/explore/components/controls/FilterControl/AdhocFilterEditPopoverSimpleTabContent/useAdvancedDataTypes.ts

@@ -47,6 +47,7 @@ const useAdvancedDataTypes = (validHandler: (isValid: boolean) => void) => {
         setAdvancedDataTypesState(INITIAL_ADVANCED_DATA_TYPES_STATE);
         return;
       }
+      validHandler(false);
       debounce(() => {
         const queryParams = rison.encode({
           type: subjectAdvancedDataType,